Manhole.



No. 763,708. PATEN'TED JUNE 28, 1904.

H. c. BAKER, JR;

MANHOLE.

APPLICATION mum 0013.26. 1903.

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WITNESSES I TTOIM'EYS No. 763,708. PATENTBD JUNE 28, 1904.

H. G. BAKER, JR.

MANHOLE.

APPLICATION FILED OCT. 26. 1903.

no MODEL. 2 sums-sum z.

WITNESSES IN YEN 70R Tue uonrus warns co, woTo-uma. WASHINGTON, DV 0,

IiTo. 763,708.

Patented.- J'une 28, 1904.

HUGH C. BAKER, JR,

OF NEW YORK, N. Y.

MANHOLE.

SPECIFICATION forming part of Letters Patent No. 763,708, dated June 28, 1904.

Application filed October 26, 1903.

To aZZ whom it may concern.-

Be it known that I, HUGH G. BAKER, J r., a subject of the King of Great Britain, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Manholes, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide a manhole for electrical and other conduits of improved construction, whereby'the construction is simplified and the cost thereof mate; rially reduced, a further object being to provide an improved cover for manholes of this class; and the invention consists of the form of the manhole and the details of the construction of the various parts thereof, as hereinafter described and claimed.

The invention is fully disclosed in the following specification, of which the accompanyingdrawings form a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Figure 1 is a transverse section of a manhole made according to my invention; Fig. 2,

a section on the line 2 2 of Fig. 1, part of the construction being broken away; Fig. 3, a plan view'of the cover in position; Fig. 4, a section on the line 4 4L of Fig. 3; Fig. 5, a plan and inside View of one of the bricks or blocks which I employ in the construction of the manhole; Fig. 6, a similar view of another form of the bricks or blocks which I employ in the construction of the manhole, and Fig. 7 an inside view of one of the bricks or parts used in the construction of the cover of the manhole.

Serial No. 178,505. (No model.)

' are of two different forms a and a, whichare shown in detail in Figs. 5 and 6, while the cover 0 of the manhole is composed of three diiferent styles of bricks or blocks 0 0 and 0*, one of the latter being shown in Fig. 7.

In each of the horizontal layers of bricks or blocks which make up the body portion of the manhole four of the bricks or blocks a are employed and four of the bricks or blocks (0 and the bricks or blocks a in each layer compose the ends and a part of one side of each of said layers, and through one of these bricks or blocks the conduit-or conduits d are passed, and the positions of the end bricks or blocks a of one layer are reversed in the next layer, as clearly shown in Fig. 2 by dotted lines.

The bricks or blocks in the separate horizontal rows or layers which make up the body portion of the manhole are all of the same general form; but the bricks or blocks in the top27 layer are beveled inwardly and downwardly, as shown at e in Fig. 1, and said bricks or blocks of the top layer are also preferably reinforced with metal, as shown at f in Fig. 1,

and it will be apparent that in view of the top formation of the bricks or blocks in the top layer of said bricks or blocks cannot be reversed, and in forming these bricks or blocks different molds are required from those embricks or blocks 0 compose the side portions thereof, and all of said blocks are reinforced with metal, as shown at 0 in Fig. l and also in Fig. 7 r

In the central portion of the topor cover is formed the usual opening 0 and this opening is preferably circular in form, and around the 9 same and resting on the top or cover is placed a collar g, on which is placed the usual removable cap g It will be observed that the bricks or blocks a in each of the horizontal layers that make up the body portion of the manhole are abruptly curved at one end, as shown at a in Fig. 2, this formation being necessary in order to enable these bricks or blocks to be reversed at the opposite ends of said layer, so as to complete the necessary form of the manhole in horizontal section, and in the formation of the said bricks or blocks a and (4* only two molds are necessary, except in the formation of the bricks or blocks which make up the top layer, as hereinbefore stated, while three molds are necessary to form the bricks or blocks 0 c and 0*, which make up the cover of the manhole.

It will be understood, of course, that the dimensions of the separate bricks or blocks which make up the body portion of the man hole and also the top or cover thereof may be regulated so as to produce a manhole of any desired size in horizontal section, and the depth of the manhole will depend on the depth of the separate bricks or blocks a and (0* and on the number of the layers of such bricks or blocks employed in the construction of the body portion of the manhole, and in practice these bricks or blocks are placed together in the manner of ordinary bricks or blocks, so that the joints in one layer are broken or overlapped by the bricks or blocks ofthe layer thereover, and the reversal of the position of the end bricks or blocks a in the formation of each layer accomplishes this result.

The separate bricks or blocks of which the top portion or cover 0 is composed are arched, as shown, and when the said bricks or blocks are placed together they form a top or cover which possesses all the necessary strength, and the lower end portions thereof are beveled to correspond with the bevel at e of the bricks or blocks which make up the top layer of the body portion of the manhole, and the metal reinforcing material placed in the bricks or blocks of the top or cover gives to the said bricks or blocks all the strength and resistance necessary. It will also be observed that the bricks or blocks (o which make up the side portions of the separate layers which form the body portion of the manhole, are curved longitudinally, so as to give the required shape to the side portions of the manhole, and the curve of one of the bricks or blocks a at the sides of said layer is similar to that of the bricks or blocks a, and by reason of the form of the bricks or blocks a the end portions of the manhole are substantially straight or at right angles to the conduits d, and the end portions of all said bricks or blocks are formed at such an angle to the inner and outer sides thereof that when placed together in layers the joints thcreof'are closed and no openings or interstices are formed in such layers, and the adjacent top and bottom surfaces of the bricks or blocks which make up each layer are also preferably provided with recesses it, which may be of any desired shape and size, and the cement placed between the separate layers enters these recesses and serves to bind the separate layers of the body portion of' the manhole together and to give strength and resistance thereto.

The manhole is also provided with the usual bottom drain a, and while my invention is particularly adapted for use in the construction of manholes for electrical conduits the principle thereof may also be employed in "the construction of manholes, catch-basins,

sewers, drains, and other conduits of various kinds and classes.

Although I have described the bricks or blockswhich make up the body portion and cover of the manhole as composed of concrete material, it will be apparent that the said bricks or blocks may be composed of any material capable of being molded, cut, or pressed into the required form and possessing the necessary strength.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A manhole which is substantially elliptical in horizontal section, the end portions thereof being also at substantially right angles to the longitudinal diameter thereof, the body portion of the manhole being composed of separate layers of bricks or blocks, each of said layers being composed of bricks or blocks of two difl'erent shapes, the bricks or blocks at the ends of said layers being abruptly curved at one end, said manhole being'also provided with a cover composed of bricks or blocks of three difi'erent shapes, said bricks or blocks of the cover being reinforced with metal, substantially as shown and described.

2. A manhole which is substantially elliptical in horizontal section, the end portions thereof being also at substantially right angles to the longitudinal diameter thereof, the body portion of the manhole being composed of separate layers of bricks or blocks, each of said layers being composed of bricks or blocks of two different shapes the bricks or blocks at the ends of said layers being abruptly curved at one end, said manhole being also provided with a cover composed of bricks or blocks of three different shapes, said bricks or blocks of the cover being reinforced with metal, the top layer of bricksor blocks which make up the body portion ofthe manhole being beveled inwardly and downwardly and the adjacent ends of the bricks or blocks which compose the cover being correspondingly beveled, substantially as shown and described.

3. An arch cover for manholes composed of bricks or blocks of three different shapes or styles, the end portions of said cover being composed of two bricks or blocks and the side portions thereof of one brick or block, substantially as shown and described.

4:. An arch cover for manholes composed of bricks or blocks of three different shapes or styles, the end portions of said cover being composed of tWo bricks or blocks and the side 7 portions thereof of one brick or block, and

said bricks or blocks being reinforced with metal; substantially as shown and described.

5. An arch cover for manholes composed of bricks or blocks of different shapes or styles, the end portions of said cover being composed of two different bricks or blocks and the IQ side portions thereof being composed of similar bricks or blocks, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing Witnesses, this 23d day 5 of October, 1903.

HUGH C. BAKER, JR. Witnesses:

F. A. STEWART, O. E. MULREANY. 

